Therefore, Cumulative Layout Shift (CLS) measures the visual stability of a page as it loads. It does this by looking at how big elements are and how far they move. It’s one of the three Core Web Vitals metrics Google uses to measure page experience. CLS is calculated during the five-second window where the most shifting occurs.The reason CLS is important is it’s annoying when you try to click something on a page that shifts and then end up clicking on something you don’t intend to. It happens to me all the time.
I click on one
Thing and, suddenly, I’m clicking on an ad and am now not even on the same website. As a user, I find that frustrating.There are different ways of measuring CLS: field data executive data and lab data. Field data comes from the Chrome User Experience Report (CrUX), which is data from real users of Chrome who choose to share their data. This gives you the best idea of real-world CLS performance. It’s also what you’ll actually be measured on by Google for Core Web Vitals. Lab data is based on tests with the same conditions to make tests repeatable.
Layout Shift doesn’t use
Therefore, This for Core Web Vitals. But it’s useful for testing because CrUX/field data is a 28-day rolling average, so it takes a while to see the impact of changes. The best tool to Hong Kong Lead measure CLS depends on the type of data you want (lab/field) and whether you want it for one URL or many.You’ll also want to reserve the space needed for things like videos and iframes. For dynamic content like ads, you will want to reserve the max space needed. There’s also a relatively new CSS property called aspect-ratio that will allow you to set a dynamic width based on the screen size, and the browser will calculate the appropriate height for you.